def my_decorator(func):  
    def wrapper(*args, **kwargs):  
        print("函数执行前")  
        for i in args:
            print(i)
        result = func(*args, **kwargs)  
        print("函数执行后")  
        return result  
    return wrapper  
  
@my_decorator  
def add(x, y):  
    print("Hello!!!")
    return x + y  
  
print(add(5, 3))